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WPL 50 Louvre Selection
Weather Resistant Louvres
Example: To select a louvre to exhaust 0.595m3/s
with a pressure drop of 20Pa.
Step One: From the Performance Chart below select
the Pressure Drop of 20 Pa. Plot across to the exhaust curve.
Then plot down to the indicated free Area Velocity e.g. 4.3
m/s.
WPL50 PERFORMANCE
(Tested at Auckland Ventilation Services,
Sept 2000, test results available on request)
Step Two: Calculate the required Free Area of the
louvre.
Free Area = Volume Flow Rate/Free Area Velocity
Free Area = 0.595 (m3/s)/4.3 (m/s) = 0.13 (m2)
Step Three: Select a suitable louvre from the Free
Area (m2) table. Some suitable louvres from
the Free Area Table are:
- 0.500m wide x 0.800m high
- 0.600m wide x 0.700m high
- 0.300m wide x 1.400m high
- 0.450m wide x 0.900m high
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